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CSME 2020/12
Volume 41 No.6
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773-780
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Temperature Control of a Plastic Injection Molding Machine Using Closed-loop Control Based on System Identification
Peeraya Pongpanyaporn a, Chin-Wen Lina and Yong-Lin Kuoa
aGraduate Institute of Automation and Control, National Taiwan University of Science and Technology, Taipei, Taiwan 106, ROC.
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Abstract:
The temperature control of injection machines is generally achieved by using an auto-tuning PID controller. However, auto-tuning may not meet the industrial demands in some situations. Therefore, it is necessary to switch to manual adjustment, but it will take more time and use more plastic materials. This paper presents a temperature controller design of a plastic injection molding machine by constructing a closed-loop feedback control system based on system identification. System identification treats a system as a black box. By conducting an experiment to record the input and output data, a mathematical model of the system can be obtained. Therefore, based on the model, the system can be systematically analyzed, and the dynamical characteristics can be obtained. Furthermore, the model can be used to predict and validate other experimental results. In this study, first of all, the mathematical model of the machine is established through a system identification experiment to collect input and output data of the machine and then the software Matlab System Identification Toolbox used to evaluate the model. Secondly, based on the established model, a PID controller is designed based on the Ziegler-Nichols tuning method, and the numerical simulations are performed in order to satisfy the requirements of the machine. Finally, some experiments are conducted so as to validate the controller, and the results show that the temperature control performance meets the requirements of the machine.
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Keywords: plastic injection molding machine, system identification, temperature control.
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*Corresponding author; e-mail:
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©
2020
CSME , ISSN 0257-9731
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